To compile xsis, MIT X11R4 or X11R5 is needed. xsis is based on the
X Toolkit and Athena widget set. If you don't have this, just comment
out the xsis lines in the Makefile. All other sis programs will work
without it.

INSTALLING SIS:

SIS is distributed via a single file called sis-1.2.tar.Z.
First uncompress it, then extract the files (the directory
you do this in should have at least 22 MBytes):

uncompress sis-1.2.tar.Z
tar xf sis-1.2.tar

You will now have a directory containing all the source code
used in SIS.

If you do not have the Berkeley OctTools, you will be able to
run everything except the read_oct and write_oct commands in
SIS. If you do not have X11-R4, you will be able to run everything
except the program xsis, which is a front-end graphical interface
to sis. To compile all programs, only the top level Makefile needs
to be edited.

If you have the Berkeley OctTools:

Copy the file Makefile.oct to Makefile. Edit the Makefile,
changing the CAD variable to the directory where the OctTools
are installed (the compiler will need CAD/include and CAD/lib).
Set the MACHINE variable to be the machine on which you are compiling
(e.g. mips, vax, rs6000, sun4), set SRCDIR variable to the current
directory, and set the X11 variable to the directory where the X11-R4
source is (the compiler will need X11/include, X11/include/Xaw, and
X11/lib). If you have any trouble compiling the octio package,
try compiling SIS as though you didn't have the OctTools (see next
section).

If you do not have the Berkeley OctTools:

Copy the file Makefile.nooct to Makefile. Edit the Makefile,
setting the variables MACHINE, SRCDIR, and X11 as above.